bc means that the ¨b¨ pawn captured the ¨c¨ pawn and likewise db means that the ¨d¨ pawn captured the ¨b¨ pawn. Hope this helps.
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I'm studying Clasical Kings Indian by Nunn. I understand 1. d4 nc3 so on. What does 10. bc db refer to? I'm not familliar with this notation.